Shine is a beautiful thing on your hair, lips, and nails — that's for certain. Shine on your face, however, can get tricky. There's a difference between having a gleaming, strategically placed highlight accentuating your cheekbones and having a greasy slickness coating every inch of your T-zone. That overabundance of oil in all the wrong places is created by the sebaceous glands in your skin. Environmental conditions — whether it's the summer sun, a dry winter wind, or the humidity on your tropical getaway — also play a huge role in how slick your skin is. Luckily, there are a few things — more than a few things — you can do to alleviate greasy skin when shininess isn't on your wish list.